deletions | additions       diff --git a/bibliography/biblio.bib b/bibliography/biblio.bib  index ce601de..a799d1d 100644  --- a/bibliography/biblio.bib  +++ b/bibliography/biblio.bib 
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title = {{A {SPEM}-Based Software Process Metamodel for {CMM}}},  journal = {Journal of Software},  }  @article{Russell_2009,  doi = {10.1007/s00450-009-0059-7},  url = {http://dx.doi.org/10.1007/s00450-009-0059-7},  year = {2009},  month = {mar},  publisher = {Springer Science $\mathplus$ Business Media},  volume = {23},  number = {2},  pages = {67--79},  author = {Nick Russell and Arthur H. M. ter Hofstede},  title = {{Surmounting {BPM} challenges: the {YAWL} story}},  journal = {Comp. Sci. Res. Dev.},  }